RFID and distance reporting feasibility

Projects General Guidance
1

I am wondering the feasibility for a gizmo that I am imagining:

What I would like to do is have a center object that would be "aware" of other objects around it. Based on the distance to the center object the outer objects would generate different sounds.

I thought maybe an RFID "tag" sort of device on the outer objects and an RFID "reader" on the center one. Depending on the virtual radial band in which the outer objects lie, a different sound would be made.

I am unsure if RFID can transmit distance information. Or if it does, at a small scale like one that would inhabit a table top rather that a warehouse; as in current tracking scenarios I am aware of. Maybe bluetooth? Would this would classify as "near-field" perhaps?

I dunno, not sure if the technology out there would work for what I envision. I certainly do not think a range sensor is applicable as that would be line of sight or a linear distance. I want a radial model like the Bohr model of the atom.

2

From my understanding of RFID this wouldn't work for a couple of reasons

The reader can only read from one RFID tag at a time, the closest one draws the most current so has the most power and that is the only one 'heard'

As well as this there is no way of transmitting distance, unless you managed to make a calculation based on the amplitude of the response from the semi-passive tags.

3

But is that not the difference between active and passive RFID tags? As far as one at a time vs. many?